Which @angular/* package(s) are the source of the bug?

compiler

Is this a regression?

No

Description

Consider these styles:

:host:nth-child(1 of *:not(.lol):not(.whatever)) {
  color: blue;
}

:host:nth-child(1 of *:not(.whatever)) {
  color: red !important;
}

First one works correctly but the second one, without dual :not, adds an unexpected content attribute to selector.

Please provide a link to a minimal reproduction of the bug

https://stackblitz.com/edit/stackblitz-starters-tnsye4fb

Please provide the exception or error you saw

[_nghost-ng-c1419874505]:nth-child(1 of *:not(.lol):not(.whatever)) {
  color: blue;
}

[_nghost-ng-c1419874505][_ngcontent-ng-c1419874505]:nth-child(1 of *:not(.whatever)) {
  color: red !important;
}

Please provide the environment you discovered this bug in (run ng version)

Latest

Anything else?

No response